Research On Urban Spatial Structure Of Shenyang Based On Condensation Nucleus-Network

With the continuous development of digitalization,informatization and networking,the mobility of various elements between cities and within cities has been continuously enhanced,and the spatial structure of cities has gradually changed from hierarchical to networked.At the same time,the scale of the city continues to expand,the space expands rapidly,and its internal spatial differentiation increases.Traditional urban spatial research mostly takes macroeconomic development as the research background,discusses the spatial structure and layout of largescale regions,and lacks the analysis of urban spatial development,spatial network organization law and reconstruction.In addition,the node elements of network construction at the global scale or at the city and regional scales are based on cities,and the delineation of node elements for the construction of spatial networks within cities is an important research problem.The geographical perspective mostly takes blocks or square grids as node units,and the architectural category believes that building units are node elements within the city.The proposal of these nodes can’t provide a node element covering both its own physical attributes and the social attributes of the node in the city for the construction of the city’s internal network,and the node element itself should have its own characteristics like the city nodes in the global or regional scale network,and at the same time form a network through connection and communication with the outside world.Based on this,according to the logical order of node-edge-network in urban spatial network,this study first starts from the important node elements that play a role in agglomeration in the city,and identifies and explores the spatial distribution characteristics and agglomeration effect of urban condensation nuclei in the city by establishing identification indicators and spatial analysis based on the data of points of interest and areas of interest.Secondly,starting from the connecting edge elements,the urban skeleton that connects nodes and plays the role of transmitting interactive elements in urban space is identified,and its network morphology and hierarchical characteristics are analyzed,so as to pave the way for identifying the connection and agglomeration between urban condensation nuclei in network space.Then,taking the urban condensation nucleus as the node,the urban skeleton between the condensation nuclei,that is,the urban road network as the connecting edge,the network structure was constructed to describe the urban internal space,and the microscopic scale of several urban spatial network organizations in the city was identified by the method of minimum spanning tree,and the spatial organization characteristics of the established urban internal spatial network were found on the basis of the previous two chapters.Finally,the operation and formation mechanism of elements and patterns in urban spatial network are discussed,which provides a new perspective for understanding urban spatial structure and proposes corresponding strategies for the optimization of urban spatial structure.The results show that:(1)There are advantageous spatial elements in urban space,such as urban condensation nuclei,which play a role in agglomeration and play a leading role in urban ecology on the micro scale.Among them,there are obvious differences in the number and level of urban condensation nuclei.Large shopping malls in the category of commercial services,large hospitals,scientific and educational places in the category of public services,and major transportation hubs have stronger influence and significance levels.The spatial morphology of condensation nuclei in cities with different functions is obviously different.Both the public service and the living space have a decreasing circle structure from the center to the periphery.Production and ecological space have obvious agglomeration centers,and the whole distribution is scattered.Production space has a high degree of agglomeration at the edge of the study area,while business service space and traffic space have obvious high agglomeration centers.(2)The internal spatial network organization has the difference and differentiation of scale,and the spatial polycentric morphological characteristics are significant.At the same time,the condensation core itself forms the spatial agglomeration area through the urban skeleton.Larger network groups containing more urban condensation nuclei assume urban functions in a larger area,while a large number of small-scale simple network groups operate at the scale of the local block and assume relatively single functions.In addition to the large-scale Taiyuan Street,South market,Middle street and City Square and other places,the agglomeration groups of different sizes show a polycentric distribution characteristics in space.(3)The geographical location difference,the agglomeration effect of spatial elements and the difference and compatibility among elements make the inner space of the city formed and maintained by the network structure between the urban condensation core and the surrounding elements,as well as the urban condensation core and condensation nodules,and intermingled in the urban space in a certain order.Various functional elements are interdependent and symbiotic.(4)According to the characteristics of urban condensation core and urban spatial network organization,the spatial optimization strategy is proposed.While scientifically planning and grasping the intervention degree of market and public policy,it is necessary to pay attention to the spatial organization efficiency of functional elements,strengthen the original stock adjustment,form the elastic network structure combining agglomeration and diffusion,and promote the harmonious and healthy development of urban space.